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| The two times during an Earth year when the rays of the sun directly strike one of the two tropical latitude lines. |
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| June 20 or 21 marks the beginning of summer in the northern hemisphere and simultaneously heralds the beginning of winter in the southern hemisphere |
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Definition
| there are 24 hours of daylight north of the Arctic Circle (66.5° north of the equator) and 24 hours of darkness south of the Antarctic Circle (66.5° south of the equator). |
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Term
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Definition
| The sun's rays are directly overhead along the Tropic of Cancer (the latitude line at 23.5 degrees) on June 21. |
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Definition
| December 20 or 21 marks the beginning of winter in the northern hemisphere and also marks the beginning of summer in the southern hemisphere |
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Term
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Definition
| there are 24 hours of daylight north of the Arctic Circle (66.5° north of the equator) and 24 hours of darkness south of the Antarctic Circle (66.5° south of the equator). |
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Term
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Definition
| A __ either marks the beginning of winter, or the beginning of summer. |
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| The __ is when the nights are shortest and the daytime the longest. |
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Definition
| The __ is when the days are shortest and the nighttime the longest |
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